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  The thermal stability of topologically close-packed phases in the single-crystal Ni-base superalloy ERBO/1

Lopez-Galilea, I., Koßmann, J., Kostka, A., Drautz, R., Mújica Roncery, L., Hammerschmidt, T., et al. (2016). The thermal stability of topologically close-packed phases in the single-crystal Ni-base superalloy ERBO/1. Journal of Materials Science, 51(5), 2653-2664. doi:10.1007/s10853-015-9579-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B805-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B809-6
Genre: Journal Article

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 Creators:
Lopez-Galilea, Inmaculada1, Author              
Koßmann, Jörg2, Author              
Kostka, Aleksander3, 4, Author              
Drautz, Ralf5, Author              
Mújica Roncery, Laís6, Author              
Hammerschmidt, Thomas2, Author              
Huth, Stephan1, Author              
Theisen, Werner1, Author              
Affiliations:
1Lehrstuhl Werkstofftechnik, Ruhr-Universität Bochum, Bochum, Germany, ou_persistent22              
2ICAMS, Ruhr-Universität Bochum, Bochum, Germany, ou_persistent22              
3Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, 44801 Bochum, Germany, ou_persistent22              
4High-Temperature Materials, External Max Planck Fellow, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863347              
5ICAMS, Materials Research Department, Ruhr-Universität Bochum, Universitätsstraße 90a, Bochum, Germany, ou_persistent22              
6Lehrstuhl Werkstofftechnik, Ruhr-Universität Bochum, Bochum, Germany, persistent22              

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Free keywords: Chemical stability; Creep resistance; Nickel; Superalloys; Thermodynamic stability; Topology, Chemical compositions; Equilibrium conditions; Interdendritic regions; Intermetallic phasis; Isothermal heat treatments; Single-crystal Ni-base superalloys; Thermodynamic calculations; Topologically close-packed phasis, Single crystals
 Abstract: In Ni-base superalloys, the addition of refractory elements such as Cr, Mo, Co, W, and Re is necessary to increase the creep resistance. Nevertheless, these elements induce the formation of different kinds of intermetallic phases, namely, the topologically close-packed (TCP) phases. This work focuses on intermetallic phases present in the second-generation single-crystal (SX) Ni-base superalloy ERBO/1. In the as-cast condition, the typical γ/γ′ structure is accompanied by undesirable intermetallic phases located in the interdendritic regions. The nature of these precipitates as well as their thermal stability between 800 and 1200 °C has been investigated by isothermal heat treatments. The investigation techniques include DSC, SEM, EDX, and TEM. The experimental information is complemented by (1) comparison with a structure map to link the local chemical composition with phase stability, as well as (2) thermodynamic calculations based on the CALPHAD method to determine the occurrence and composition of phases during solidification and in equilibrium conditions. The TCP phases Laves, µ and σ were identified in various temperature/time ranges. © 2015, Springer Science+Business Media New York.

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Language(s): eng - English
 Dates: 2016-03-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s10853-015-9579-7
BibTex Citekey: Lopez-Galilea20162653
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Title: Journal of Materials Science
  Abbreviation : JMS
Source Genre: Journal
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Publ. Info: New York, NY, USA : Springer
Pages: - Volume / Issue: 51 (5) Sequence Number: - Start / End Page: 2653 - 2664 Identifier: ISSN: 0022-2461
CoNE: /journals/resource/954925415936_1